NATHAN Matthews has been found guilty of the murder of his teenager step-sister Becky Watts in a sexually-motivated kidnap plot.

Nathan Matthews has been found guilty of murdering his stepsister Becky Watts

Matthews has also been found guilty of kidnapping the 16-year-old.

He went on to cut up her body with a chainsaw in actions detectives investigating the murder described as "depravity that is virtually impossible to comprehend".

The verdict was decided by the jury in record timing after only a few hours.

Becky's family held hands as they listened to proceedings.

His girlfriend Shauna Hoare has been found guilty of kidnap and manslaughter.

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16-year-old Becky was dismembered by her stepbrother with a circular saw

There was a big cheer among people in the courtroom as the verdict came back on Matthews.

Hoare, 21, was also found guilty of perverting the course of justice, preventing burial and possessing a weapon.

A jury of 10 women and one man returned the verdicts after just three hours and 27 minutes of deliberations on six charges against Matthews and Hoare as well as two men accused of helping move and hide Becky's body parts.

Sentencing of the pair is due to take place at 10am on Friday.

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Nathan Matthews, left, and Shauna Hoare, right, were found guilty in the Becky Watts trial

After the verdicts Becky's dad said Matthews and Hoare should pay with their own lives for the barbaric murder.

Darren Galsworthy told the BBC: "There's only one way to pay for this sort of crime - and that's by losing their own lives."

Mr Galsworthy said he and his wife Anjie - Matthew's mother - had been through "hell on earth".

He said: "It has been horrendous. I wouldn't put my worst enemy through it.

"I was so desperate to get her back....It was ripping my heart out.

"I lost nearly four stone in weight, I couldn't eat and could barely keep water down.

"She was my youngest...the devastation and heartbreak is indescribable, I don't have the vocabulary to describe it."

He added: "Nathan was so arrogant he thought he could get away with it.

"I loved him like my own son - I hate him now.

"Clearly there's something psychologically wrong with the pair of them."

Asked for her thoughts about what he her son has done, Matthew's mother said: "I was just devastated, I couldn't explain it.

"He's always been open and honest with me.....he seemed fine."

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Becky Watts went missing on February 19

The mother, grandmother and brother of Becky Watts have paid tribute to her saying she was like a "like a tornado, hurricane and sunbeam all at once".

In a statement they said: "We wish that Becky was still alive, instead we have spent the last five weeks hearing evidence about how she came to be killed by someone who she regarded as her own family.

"We would like to thank the police and the prosecution legal team for all of their hard work and thorough investigation.

"We saw for ourselves the amount of work that went in to bring about justice for Becky.

"We would also like to thank the jury for taking the time to carefully listen to the often very harrowing evidence.

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Matthews during police questioning over the killing

Matthews, 28, suffocated his 16-year-old stepsister while trying to kidnap her from her family home in Crown Hill, Bristol, on February 19.

Her body was dragged into the boot of his Vauxhall Zafira and driven to the home Matthews shared with Hoare where her body was dismembered.

Over the next three days Matthews used bags, cling film and tape to package Becky's body before putting her remains in a garden shed.

Becky's remains were discovered in suitcases, bags, and a blue box in the shed at Barton Court - 80 metres from the couple's home.

Matthews always admitted killing the teenager but claimed it was accident and denied murder.

A post-mortem examination found Becky was suffocated during a "violent struggle" and suffered 15 stab wounds and a slash across her stomach after death.

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Matthews was pictured by a friend in women's underwear in 2009

The couple remained at the house - with Becky's body in their boot - for a further eight hours before driving home.

They ordered a Chinese takeaway before using their phones to browse for television programmes and order a pizza.

Becky's father reported her missing the following day and police launched an investigation.

Over the following days, Matthews and Hoare were captured on CCTV shopping for items including black bags, rubble sacks, rubber gloves and three rolls of clingfilm.

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Matthews was pictured on CCTV in a shop buying a chainsaw

Detective Superintendent Mike Courtiour condemned the "heinous" plot to murder Becky - and described Hoare as "cold blooded and calculating".

He said: "I would like to take this opportunity to pay tribute to Becky's family and friends who have shown the utmost composure and dignity during what has undoubtedly been the worst period of their lives.

"Becky Watts was a typical teenager who was well loved and, like most teenagers, had many plans and hopes for the future. Tragically, Nathan Matthews and Shauna Hoare have made sure these hopes and dreams will never be realised."

He said Matthews and Hoare "concocted a heinous plan" to kidnap the teenager.

He added: "The body of evidence however, has suggested a more sinister motive relating to their deep-seated hatred for Becky and their twisted sexual desires."

James Ireland and Donovan Demetrius have been found not guilty of assisting an offender.

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One of the suitcases used in the killing of Becky Watts

There followed a deliberate, carefully planned and grotesquely executed plan to cover up her killing

William Mousley QC

Prosecutor William Mousley QC told the jury at the beginning of the trial: "She was suffocated, despite her fighting for her life.

"There followed a deliberate, carefully planned and grotesquely executed plan to cover up her killing."

Mr Mousley said Matthews and Hoare planned to kidnap Becky and had brought a stun gun, handcuffs, tape and a large bag to her home.

He added: "In addition to their apparent dislike of Becky, there is good reason to believe there was also a sexual motive behind the scheme, arising from a shared unnatural interest in attractive teenage females, and that a foreseeable conclusion to it being carried out would either be Becky's death or serious injury."

Hoare and Matthews were said to share an interest in petite teenage girls and had exchanged text messages about kidnapping schoolgirls, the court heard.

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